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/* ISC license. */
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <regex.h>
#include <stdio.h>
#include <skalibs/posixplz.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/sig.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <skalibs/iopause.h>
#include <skalibs/sassserver.h>
#include "ftrigr-internal.h"
#include <skalibs/posixishard.h>
#define FTRIGRD_MAXREADS 32
#define FTRIGRD_BUFSIZE 32
#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
typedef struct ftrigio_s ftrigio, *ftrigio_ref ;
struct ftrigio_s
{
ftrigio_ref prev ;
ftrigio_ref next ;
unsigned int xindex ;
uint32_t id ;
uint32_t flags ;
buffer b ;
char buf[FTRIGRD_BUFSIZE] ;
int fdw ;
size_t start ;
stralloc sa ;
regex_t re ;
} ;
#define FTRIGIO_ZERO { .prev = 0, .next = 0, .xindex = 0, .id = 0, .flags = 0, .b = BUFFER_INIT(0, -1, 0, 0), .buf = "", .fdw = -1, .start = 0, .sa = STRALLOC_ZERO }
static ftrigio ftrigio_head = { .prev = &ftrigio_head, .next = &ftrigio_head, .start = 0, .sa = STRALLOC_ZERO } ;
#define numio (ftrigio_head.start)
static void cleanup (void *x)
{
(void)x ;
for (ftrigio *p = ftrigio_head.next ; p != &ftrigio_head ; p = p->next)
unlink_void(p->sa.s) ;
}
static void ftrigio_remove (void *x)
{
ftrigio *p = x ;
p->next->prev = p->prev ;
p->prev->next = p->next ;
numio-- ;
p->prev = p->next = 0 ;
unlink_void(p->sa.s) ;
fd_close(p->fdw) ;
fd_close(buffer_fd(&p->b)) ;
p->sa.len = 0 ;
regfree(&p->re) ;
}
static int ftrigio_add (void *x, uint32_t id, uint32_t flags, uint32_t opcode, char const *s, size_t len)
{
ftrigio *p = x ;
size_t pathlen ;
if (len < 3 || s[len - 1]) return EPROTO ;
pathlen = strlen(s) ;
if (pathlen + 1 >= len) return EPROTO ;
p->start = pathlen + 41 ;
if (!stralloc_ready(&p->sa, p->start)) { cleanup(0) ; dienomem() ; }
{
char tmp[p->start + 1] ;
int r = skalibs_regcomp(&p->re, s + pathlen + 1, REG_EXTENDED) ;
if (r) return r == REG_ESPACE ? ENOMEM : EINVAL ;
memcpy(tmp, s, pathlen) ;
memcpy(tmp + pathlen, "/.ftrig1:", 9) ;
if (!timestamp(tmp + pathlen + 9)) goto err0 ;
memcpy(tmp + pathlen + 34, ":XXXXXX", 8) ;
r = mkptemp3(tmp, 0622, O_NONBLOCK | O_CLOEXEC) ;
if (r == -1) goto err0 ;
buffer_init(&p->b, &buffer_read, r, p->buf, FTRIGRD_BUFSIZE) ;
p->fdw = open_write(tmp) ;
if (p->fdw == -1) { unlink_void(tmp) ; goto err1 ; }
stralloc_copyb(&p->sa, tmp, pathlen + 1) ;
stralloc_catb(&p->sa, tmp + pathlen + 2, 40) ;
if (rename(tmp, p->sa.s) == -1) { unlink_void(tmp) ; goto err2 ; }
}
p->id = id ;
p->flags = flags ;
p->prev = &ftrigio_head ;
p->next = ftrigio_head.next ;
ftrigio_head.next = p ;
numio++ ;
(void)opcode ;
return 0 ;
err2:
fd_close(p->fdw) ;
err1:
fd_close(buffer_fd(&p->b)) ;
err0:
regfree(&p->re) ;
return errno ;
}
static inline int ftrigio_read (sassserver *a, ftrigio *p)
{
unsigned int i = FTRIGRD_MAXREADS ;
while (i--)
{
size_t blen ;
ssize_t r = sanitize_read(buffer_fill(&p->b)) ;
if (!r) break ;
if (r == -1)
{
sassserver_async_failure(a, p->id, errno) ;
return 0 ;
}
blen = buffer_len(&p->b) ;
if (!stralloc_readyplus(&p->sa, blen+1)) { cleanup(0) ; dienomem() ; }
buffer_getnofill(&p->b, p->sa.s + p->sa.len, blen) ;
p->sa.len += blen ;
p->sa.s[p->sa.len] = 0 ;
if (!regexec(&p->re, p->sa.s + p->start, 0, 0, 0))
{
sassserver_async_success(a, p->id, p->flags, p->sa.s + p->start, p->sa.len - p->start) ;
p->sa.len = p->start ;
}
}
return 1 ;
}
int main (void)
{
sassserver a = SASSSERVER_ZERO ;
int r = 0 ;
PROG = "s6-ftrigrd" ;
if (ndelay_on(0) == -1 || ndelay_on(1) == -1)
strerr_diefu1sys(111, "make fds nonblocking") ;
if (!sig_altignore(SIGPIPE))
strerr_diefu1sys(111, "ignore SIGPIPE") ;
if (!tain_now_set_stopwatch_g())
strerr_diefu1sys(111, "tain_now_set_stopwatch") ;
{
tain deadline ;
tain_addsec_g(&deadline, 5) ;
sassserver_init_g(&a, FTRIGR_BANNER1, FTRIGR_BANNER2, &ftrigio_add, &ftrigio_remove, sizeof(ftrigio), &cleanup, 0, &deadline) ;
}
while (!r)
{
tain deadline = TAIN_INFINITE ;
iopause_fd x[3 + numio] ;
sassserver_prepare_iopause(&a, x, &deadline) ;
for (ftrigio *p = ftrigio_head.next ; p != &ftrigio_head ; p = p->next, r++)
{
p->xindex = 3+r ;
x[3+r].fd = buffer_fd(&p->b) ;
x[3+r].events = IOPAUSE_READ ;
}
r = iopause_g(x, 3 + numio, &deadline) ;
if (r == -1)
{
cleanup(0) ;
strerr_diefu1sys(111, "iopause") ;
}
if (!r)
{
sassserver_timeout(&a) ;
continue ;
}
sassserver_write_event(&a, x) ;
for (ftrigio *p = ftrigio_head.next ; p != &ftrigio_head ; p = p->next) if (x[p->xindex].revents & IOPAUSE_READ)
{
if (!ftrigio_read(&a, p))
{
p = p->prev ;
ftrigio_remove(p->next) ;
}
}
r = sassserver_read_event(&a, x) ;
}
cleanup(0) ;
_exit(0) ;
}
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